test plan:
* turn on cross-shard invitations in the console
(Setting.set('cross_shard_invitations', '1'))
* create a user with an email address in a shard (NOT
a site admin)
* in an unrelated shard with open registration on,
as an admin invite that e-mail address to a course
* log in as the original user on the first shard; the invitation
should show up on your dashboard
* accepting/rejecting that invitation is *not* yet supported
Change-Id: I3b0c9657fe0dd37a737af9f4253ea8ef8b2f2b91
Reviewed-on: https://gerrit.instructure.com/14903
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Jacob Fugal <jacob@instructure.com>
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